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Jest encountered an unexpected token with react-native

So I'm trying to write tests on my React Native app with Jest and TypeScript. While using old babel version everything worked fine, but because of some project problems we had to upgrade babel to 7.0.0. After that I couldn't make it work. Any help is appreciated

Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".

/home/levan/work/vabaco-dhp-frontend/packages/dhp-mobile-app/node_modules/react-native-calendar-events/index.ios.js:3 import { NativeModules } from 'react-native';

SyntaxError: Unexpected token import

package.json:

"dependencies": {
    "react": "16.4.1",
    "react-native": "0.56.0",
    "react-native-calendar-events": "^1.6.1",
    "react-redux": "^5.0.7",
    "react-router": "^4.3.1",
    "react-router-native": "^4.3.0",
    "react-router-redux": "5.0.0-alpha.9",
    "redux": "^4.0.0",
    "redux-api-middleware": "^2.3.0",
    "redux-form": "^7.4.2",
    "redux-thunk": "^2.3.0",
    "urijs": "^1.19.1"
  },
  "devDependencies": {
    "@babel/core": "^7.0.0",
    "@babel/preset-env": "^7.0.0",
    "@types/history": "^4.7.0",
    "@types/jest": "^23.3.1",
    "@types/react": "^16.4.13",
    "@types/react-native": "^0.56.17",
    "@types/react-router": "^4.0.30",
    "@types/react-router-native": "^4.2.3",
    "babel-core": "^7.0.0-bridge.0",
    "babel-jest": "^23.4.2",
    "babel-loader": "^8.0.2",
    "babel-preset-react-native": "^5.0.0",
    "jest": "^23.5.0",
    "react-native-typescript-transformer": "^1.2.10",
    "react-test-renderer": "^16.4.2",
    "ts-jest": "^23.1.4",
    "typescript": "^3.0.3"
},


"jest": {
    "preset": "react-native",
    "transform": {
      "^.+\\.ts?$": "ts-jest",
      "^.+\\.tsx?$": "ts-jest",
      "^.+\\.js$": "babel-jest"
    },
    "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)?$",
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx",
      "json",
      "node"
    ],
    "moduleNameMapper": {
      "^.+\\.(css|less|scss)$": "identity-obj-proxy"
    },
    "transformIgnorePatterns": [
      "/node_modules/(?!(react-native|my-project|react-native-button|react-native-calendar-events)/)"
    ]
  }

babelrc:

{
  "presets": ["react-native", ["@babel/preset-env", {"modules": "commonjs"}]],
  "env": {
    "test": {
      "presets": ["react-native", ["@babel/preset-env"]]
    }
  }
}
like image 751
Leo Odishvili Avatar asked Sep 05 '18 14:09

Leo Odishvili


1 Answers

Found the solution. In transform you should use react-native/jest/preprocessor.js instead of babel-jest.

"jest": {
    "preset": "react-native",
    "moduleDirectories": [
      "node_modules",
      "src"
    ],
    "transform": {
      "^.+\\.ts?$": "ts-jest",
      "^.+\\.tsx?$": "ts-jest",
      "^.+\\.js$": "<rootDir>/node_modules/react-native/jest/preprocessor.js" <--- over here
    },
    "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)?$",
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "jsx",
      "json",
      "node"
    ],
    "moduleNameMapper": {
      "^.+\\.(css|less|scss)$": "identity-obj-proxy"
    },
    "transformIgnorePatterns": []
}
like image 188
Leo Odishvili Avatar answered Nov 13 '22 05:11

Leo Odishvili